Double-slide-valve gear for steam-engines.



L. FAISANT.

DOUBLE SLIDE VALVE GEAR FOR STEAM ENGINES.

APPLICATION rum) D30. 7, 1911.

1,096,614. Patented May 12, 1914. y g g l4 sums-sun T 1.

L. PAISANT.

DOUBLE SLIDE VALVE GEAR FOR STEAM ENGINES.

APPLICATION FILED DEC. 7, 1911.

4 SHEETS-SHEET 2.

Inventor.

Witnesses. z j g ZZMW M L. FAISANT.

DOUBLE SLIDE VALVE GEAR FOR STEAM ENGINES.

APPLICATION IILED DEC. 7, 1911.

1,096,614. Patented May 12, 1914.

4 SHEETS-SHEET 3.

N N Inventor. Witnesses. 7 2?- K,

CDLUMBIA PLANOGRAPN COUWASHINUTONI DIG.

L. PAISANT.

DOUBLE SLIDE VALVE GEAR r011 STEAM ENGINES.

Patented May 12, 19M

APPLIUATION FILED DB0.7, 1911 4 BHBETBBEEET 4.

Witnesse h Inventor. 7. K. W I m? COLUMBIA PLANOGRAPII CLL. wAslllNnroN, n. c.

LUCIEN FAISANT, OF PARIS, FRANCE.

DOUBLE-SLIDE-VALVE GEAR FOR STEAM-ENGINES.

Specification of Letters Patent.

Application filed December 7, 1911.

Patented May 12, 1914.

Serial No. 664,382.

To all whom it may concern Be it known that I, LUCIEN Fixisan'r, citizen of the French Republic, residing at Paris, Department of the Seine, in France, have invented certain new and useful Improvements in Double-Slide-Valve Gear for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. i

The invention has for its object a double slide valve mechanism for steam engines and in particular for locomotives. In this gear ing in order to prolong the expansion of the steam and reduce the compression only the phases of the exhaust are modified the ad mission being effected in the ordinary manner under the control of the principal slide valve. This slide valve is divided into three compartments and between the exhaust port and the ports giving access to the cylinder its seat is provided with two auxiliary apertures connected with the extreme orifices of the slide face of the auxiliary valve which is of ordinary construction. Toward the end of the expansion this slide valve retains the steam after it has entered one of the extreme compartments of the principal slide valve and thus retards the commencement of the exhaust. In the exhaust period, however, the steam can escape through the auxiliary slide valve after the closing of the exhaust orifice of the principal slide valve and the duration of the compression is thus reduced. In order to produce these effects the auxiliary slide valve is set 90 in ad- Vance of the driving piston. It can be controlled in a particularly simple manner in the Walschaerts or Joy gears in connecting it with the slide block by a pivoted system.

Various embodiments of the invention are illustrated in the accompanying drawing.

Figures 1 to 8 relate to a locomotive cylinder provided with a gear comprising two slide valves, one flat and the other cylindrical and operated by a Walschaerts gear. Fig. 1 is an elevation of the mechanism in section through the driving cylinder and the principal slide valve corresponding to A B C D in Fig. 2. Fig.2 is an end elevation and section on the line E E in Fig. 1. Fig. 3 is a section on the line G G in Fig. 1. Fig. 1 is a section on the line 11 in Fig. 3. Fig. 5 is a section on the line A B K L in Fig. 2. Fig. 6 is an end elevation. Fig. 7 is a section on the line M M in Fig. 5. Fig. 8 represents a modification in which the auxiliary slide valve is replaced by a system of valves. Figs. 9 to 13 illustrate a gear comprising two cylindrical slide valves which are controlled in this case also by a gear of the Walschaerts type. Fig. 9 is a longitudinal section of the driving cylinder and of the principal slide valve corresponding to the line P Q, R S in Fig. 10. Fig. 10 is a section on the line Z Z in Fig. 9. Fig. 11 is a section on the line U V X Y in Fig. 12. Fig. 12 is a section on the line IV lV in Fig. 11. Fig. 13 is a section on the line J J in Fig. 12. Fig. 14: shows the control of a double slide valve with a Joy gear The distribu'ting gear represented in Figs. 1 to 7 comprises a llat slide valve communicating with the steam inlet and an auxiliary slide valve, both valves being controlled by a lValschaerts gear. A counter crank 12 is tlxed on the pin 3 of the driving crank and is connected by a jointed rod (3 with a slot 7 oscillating around the shaft 16. A block 2 fixed to the extremity of a bar 9 is capable of displacement in the slot 7 this bar can be inclined to a greater or less extent during operation by means of an operating member of any convenient kind upon a bent lever 11 connected with the bar 9 by the rod 10. At the extremity of the bar 9 there is pivoted a lever 5 termed the advance lever which is itself pivoted in the rod 1 of the principal slide valve 39. and also connected by a rod 15 with a part 14 fixed to the cross head 13 of the piston. The displacement of the slide valve 32 is thus produced by the combined movements of the bar 9 and of the cross head 13. The steam is admitted through an opening 30 formed in a box 50 integral with the cylinder 19. The slide valve comprises three compartments separated by two partitions 411 12. The face of the slide valve presents five apertures; two admission apertures 35 and 36 giving access to the two ends of the cylinder and between these three apertures 37, 38, 39 connected respectively with three orifices 27, 28, 2.9 of

the face of the auxiliary valve 17. The median apertures 28 and 38 also communicate with the exhaust pipe. The cylindrical slide valve 17 moves in a box 18 which may be independent of the driving cylinder 19 01' integral therewith. The slide valve 17 is connected with the shaft 1 by the intermediary of a lever 20 and of a rod 25; the

lever is itself pivoted to an arm 21 rocking at 22 upon the frame. As the operation of the distributing gear is the same on both faces of the driving piston 26 it will be sufli oient to consider what takes place on the left hand side of this piston. The drawing shows the piston at the end of its stroke and the direction of travel is indicated by the arrow in Fig. 1. The pivot 8 of the rod 6 and of the crank 12 being then on the vertical line from the center of the driving wheel 29 the valve 17 occupies the mean position on its stroke. This position is such that the orifices 27 and 29 are closed. The orifice 29 remains closed so long as the valve'is situated to the right of its mean position and open when it is situated to the left of this position. The contrary is the case as regards the orifice 27. t will therefore be noted that throughout the entire stroke from left to right of the piston 26 the orifice 29 is closed while it is open during the stroke from right to left. On starting the outer ridge 33 of the slide valve 32 has already uncovered the orifice 35 supplying the steam to the cylinder by an amount which varies according to the lead given to the admission. Vi hen the admission is finished after a certain rotation the edge 16 of the slide valve uncovers the co ge 31 of the orifice The steam coming from the left hand portion of the cylinder and issuing through the orifice 35 then passes into the conduit 39 which is closed by the valve 17 and the steam therein is prevented from reaching the exhaust passage 38 by the web ll of the valve 32. The exhaust therefore only takes place at the moment at which the web ell uncovers the orifice 39 and places it in communication with the exhaust orifice 38. Immediately the piston 26 begins its movement from right to left the orifice 29 being uncovered by the slide valve 17 and consequently placed in communication with the exhaust conduit 38 the exhaust will take place at the two ends of the conduit 39 simultaneously. The movement continuing, the web 4:1 of the slide valve 32 will cover the edge do of the conduit 39. The steam will still be exhausted at the extremity 29 of this conduit the exhaust ceasing only when the edge 4E6 of the slide valve 32 covers the edge 31 of the orifice 35. The lap of the edge 46 of the slide valve 32 over the edge 31 of the aperture 35 may be smaller than in an ordinary distributing gear owing to the combined action of the web 41 and of the slide valve 17. The compression can therefore be retarded notwithstanding the increased expansion.

Fig. 8 represents an arrangement in which the auxiliary cylindrical slide valve is replaced by a system of valves. The apparatus comprises a box 48 divided intothree chambers 27, 28, 29 respectively Valves 4:3 and A l are freely mounted on this rod and springs a9 and 49 tend to cause them to bear against a shoulder t5 on the rod. Owing to this method of mounting the valve l4: remains applied to its seat during the stroke from left to right of the piston 26 and is opened during the stroke from right to left thus placing the chambers 29' and 28 in communication. The operation is the reverse for the valve 43 which controls the chamber 27.

Figs. 9 to 13 illustrate the details of a gear in which the two distributors 32 and 17 are constituted by sliding cylindrical valves. The extreme apertures 35 and 36 of the face of the principal valve in this case also end at the two extremities of the driving cylinder and the three median apertures 37, 38, 39 communicate respectively with the apertures 27, 28, 29, of the auxiliary slide valve 17. In the drawings the reference numerals indicate the parts corresponding to those already described for the construction illustrated in Figs. 1 to 7. The slide valves are controlled and the steam distributed in 7 an identical manner.

Fig. 14 shows a double slide valve mechanism actuated by a Joy gear. On the driving rod 51 a rod 53 is pivoted at 52, one of its extremities being connected with a rod 54 rocking on the frame at 55. A. rod 57 is pivoted at 56 to the rod 53 and its extremity 58 is connected by an arm 59 with the rod 1 of the slide valve. A slide block 60 fixed to the rod 57 moves in a fixed slot 61 the direc- "ion of which can be modified by causing it to rotate about its center so as to vary the speed or alter the direction of travel. A horizontal rod 63 is pivoted to the slide block 60 and its extremity 6% is pivoted to a lever 65 rocking about the pivot 66. The lower extremity of this lever is united by a rod 62 to the rod 2a of the auxiliary slide valve.

One of the methods of mounting indicated above can be adopted for the two slide valves.

The arrangement that has just been described presents the advantage as compared with double slide valve gears as heretofore constructed that it is readily adjustable and extremely simple in construction as the auxiliary slide valve can be connected directly with one of the operating parts in the case of Walschaerts and Joy gears.

I claim:

1. In valve mechanism for expansion engines, the combination of a cylinder, an ad mission port, a main exhaust passage, an auxiliary exhaust passage, a main valve adapted to control communication between the admission port and the auxiliary and main passages respectively, and an auxiliary valve adapted to prolong the expansion period by preventing the escape of the expansive fluid through the auxiliary exhaust passage until the admission port is in communication with the main exhaust passage, said auxiliary valve adapted to prolong the exhaust period by permitting the escape of the expansive fluid through the auxiliary passage until the admission port is closed by the main valve.

2. In valve mechanism for expansion en gines, the combination of a cylinder, an admission port, a main exhaust passage, an auxiliary exhaust passage, a main valve adapted to control communication between the admission port and the main exhaust passage for exhaust purposes, and an auxiliary valve adapted to prolong, the exhaust period by permitting escape of the expansive fluid through the auxiliary exhaust passage until the admission port is closed by the main valve.

3. In valve mechanism for expansion engines, the combination of a cylinder, an admission port, a main exhaust passage, an auxiliary exhaust passage, a main valve adapted to control communication.between the admission port and the main exhaust passage for exhaust purposes, and an auxiliary valve adapted to prolong the exhaust period by permitting escape of the expansive fluid through the auxiliary exhaust passage until the admission port is closed by the main valve, said main valve adapted to con trol the admission of the expansive fluid to the cylinder through the admission port independently of the auxiliary valve.

4. In valve mechanism for expansion engines, the combination of a cylinder, a piston therein, an admission port, a main exhaust passage, an auxiliary exhaust passage,amain valve adapted to control communication between the admission port and main exhaust passage for exhaust purposes, the admission port and auxiliary exhaust passage being placed in communication toward the end of the expansion period by the main valve, an

auxiliary valve set 90 in advance of the piston to prolong the expansion period by preventing exhaust through said auxiliary passage until the main exhaust passage is in (JOH'iflltlTllCiLtlOll with the admission port, and said auxiliary valve being adapted to maintain communication between the auxiliary exhaust passage and the admission port after communication has been cut oil between the main exhaust passage and admission port to prolong the exhaust period until the main valve closes the admission port.

I11 valve mechanism for expansion engines, the combination of a cylinder, admission ports, a main exhaust passage, intermediate auxiliary exhaust passages, a main valve having three compartments to place the admission ports in communication with the corresponding auxiliary exhaust passage and main exhaust passage respectively, an auxiliary valve adapted to prevent escape of the expansive fluid through the auxiliary exhaust passages during the end of the expansion periods until the main valve places an admission port in communication with the main exhaust passage for exhaust purposes, and said auxiliary valve adapted during the end oil the exhaust periods to permit escape of the expansive fluid through the auxiliary passages after communication has been cut oil between an admission port and the main exhaust passage and until the admission port is closed by the main valve.

In testimony whereof I aflix my signature, in presence of two witnesses.

LUCIEN FAISANT.

\Vitnesses BAnrLnr F. Yos'r, Gnonons BOUJY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

